单分子膜WS2谷间双激子光学斯塔克效应的观察
Observation of intervalley biexcitonic optical Stark effect in monolayer WS2
摘要：
量子材料的相干光修整提供了控制其电子性质的技术优势，例如单层过渡金属二硫属化物（TMD）中的电子谷自由度。在这里，我们观察到一种新的类型的光学斯塔克效应在单层WS2，这是介导的谷间双激子下的蓝失谐驱动与圆偏振光。我们发现，这样的螺旋光驱动不仅诱导激子能量下移的激发谷，但也会导致异常的能量上移在相反的谷，这通常是禁止的激子选择规则，但现在可以通过谷间双激子。这些发现揭示了关键的，但迄今被忽视的，双激子耦合的两个看似独立的谷，并提高谷电子学的光学控制的作用。
英文摘要：
Coherent optical dressing of quantum materials offers technological advantages to control their electronic properties, such as the electronic valley degree of freedom in monolayer transition metal dichalcogenides (TMDs). Here, we observe a new type of optical Stark effect in monolayer WS2, one that is mediated by intervalley biexcitons under the blue-detuned driving with circularly polarized light. We found that such helical optical driving not only induces an exciton energy downshift at the excitation valley, but also causes an anomalous energy upshift at the opposite valley, which is normally forbidden by the exciton selection rules but now made accessible through the intervalley biexcitons. These findings reveal the critical, but hitherto neglected, role of biexcitons to couple the two seemingly independent valleys, and to enhance the optical control in valleytronics.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
